<!-- 轮播图 -->
<nav>
    <section>
        <div id="carouselExampleFade" class="carousel slide carousel-fade" data-ride="carousel">
            <div class="carousel-inner">
                <div class="carousel-item active" data-interval="3000">
                    <img src="./images/home/banner_1.jpg" class="d-block w-100" alt="banner">
                </div>
                <div class="carousel-item" data-interval="3000">
                    <img src="./images/home/banner_2.jpg" class="d-block w-100" alt="banner">
                </div>
            </div>
            <button style="border: none;background-color: transparent;" class="carousel-control-prev" type="button" data-target="#carouselExampleFade" data-slide="prev">
                <span class="carousel-control-prev-icon" aria-hidden="true"></span>
                <span class="sr-only">上一页</span>
            </button>
            <button style="border: none;background-color: transparent;" class="carousel-control-next" type="button" data-target="#carouselExampleFade" data-slide="next">
                <span class="carousel-control-next-icon" aria-hidden="true"></span>
                <span class="sr-only">下一页</span>
            </button>
        </div>
    </section>
</nav>